Comparison of respiratory morbidity between present and ex ...
Comparison of respiratory morbidity between present and exworkers of quartz crushing units: Healthy workers' effect. Tiwari RR(1), Narain R, Sharma YK, Kumar S. Author information: (1)National Institute of Occupational Health, Ahmedabad, India. BACKGROUND: Quartz stone grinders are one such group of workers who are exposed to silica and thereby at risk of .